The frost moon and red-light apparition at Brendan's window turns an ordinary winter pane into an unexplained sign. In the darkness of the Chicago rectory, Brendan Cronin watches frost gather into a ten-inch lunar circle, sees it blaze red, and recognizes the light as something he has encountered before. The experience deepens the mystery of the golden light that has called to him in dreams, while leaving its source beyond his understanding.

Setting and Approach

At ten-ten, Brendan Cronin lies in bed with the lights out, waiting for sleep and watching the frost on his window. The pane faces the courtyard, where no lights are burning. He reasons that its pale glow must be indirect moonlight: earlier, the moon had been visible from the study windows on the opposite side of the rectory, so it could not now be above the courtyard unless it had abruptly changed course. The scene begins with his effort to account for what he sees, not with an immediate declaration of the supernatural.

As he studies the ice, its patterns become increasingly absorbing. Light seems to splinter at the points where one crystal meets another, each beam dividing into further beams. Brendan Cronin whispers, "The moon," then repeats the words, surprised to hear his own voice. His heartbeat quickens and he begins to tremble. Before he understands what the frost is becoming, the response is already physical: the image catches his attention, and apprehension takes hold.

The Frost Moon Appears

The frost changes before him. Rime melts away from the edges of the pane toward its center, until the glass is clear except for a perfect circle of ice about ten inches across. Brendan Cronin recognizes the shape as a moon and decides that it is a sign, although he cannot tell who or what has sent it, where it has come from, or what it means. The circular image is definite; its interpretation remains open.

The circle grows brighter in stages. While Brendan Cronin holds a hand toward the glass, the frost-moon shifts from milky light to a sharper white, then shines like silver. Its brilliance no longer seems proportionate to ordinary moonlight refracted by ice. A shaft leaps from the circle and falls across the bed, intense enough to resemble a spotlight. The familiar materials of window and frost have become the source of an event he cannot explain, and his attempt to understand their appearance gives way to shock.

Scarlet Light and Recognition

The beam changes from pale red through darker red to crimson and scarlet. In its glow, the blankets look like molten steel, and Brendan Cronin's outstretched hand appears wet with blood. He experiences déjà vu and becomes absolutely convinced that he has once stood beneath a scarlet moon, bathed in its bloody light. That conviction is a recognition, not an explanation: the scene gives him no account of when the earlier experience happened or what it was.

The apparition also unsettles the relation between two recurring images in his life. Since Christmas night, when he cried out in a dream at his parents' home in Bridgeport, Brendan Cronin has been unable to remember a dream about the moon. As far as he knows, his subsequent dreams have instead centered on a place full of dazzling golden light, toward which he feels called as if toward an extraordinary revelation. Now he wants to know how the red light relates to that golden radiance, but the question does not bring clarity. As the room fills with red light and shadows, fear rises into terror; the summons he associates with revelation has become frightening.

The Light Fades and the Sign Remains

When Brendan Cronin pulls his hand back, the scarlet rapidly fades to silver, and the silver dims until the frost circle reflects only the natural January moon. He switches on the lamp and approaches the window, damp with sweat and still shaken. The circle remains on the otherwise unfrosted pane. He had wondered whether the light might have been a dream or hallucination, and almost wishes that it had been; the surviving frost image persuades him that what he saw was real. It verifies the strange shape on the glass, even as the source and nature of the red beam remain unexplained.

Touching the pane reveals nothing unusual beyond the winter cold on its other side. Then Brendan Cronin notices the swollen rings in his palms and watches the stigmata fade. Their appearance and disappearance place a second bodily anomaly alongside the frost-moon, without clarifying how either is connected to the other. He returns to bed but sits upright against the headboard with the light on, waiting until he can summon enough courage to lie down in darkness.

The event therefore ends not in discovery but in a changed balance between evidence and fear. The circle persists after the red illumination has vanished, while the palm rings fade as he watches; neither leaves him with an explanation. The scene makes the moon motif tangible in the room and links it, through Brendan Cronin's startled recognition, to an experience he feels he has already lived. Yet the sign's sender and meaning remain unknown, and the golden summons that precedes it remains unresolved.